Figure 5
From: On uncertainty principle of the local polynomial Fourier transform
The signal concentration comparisons of different time-frequency rep-resentations for a two-component signal. (a) The STFT of a signal with constant frequencies; (b)-(d) The concentrations of chirp signals using the STFT, the second order LPFT, and the WVD, respectively. The horizontal axis is the normalized frequency, and the vertical axis is the normalized amplitude.